RDMA/hns: Fix congestions control algorithm type for UD

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I87LV8



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Due to hardware limitations, UD mode can only configure DCQCN.
Therefore, the default configuration in this mode is set to DCQCN,
and additional validation is applied to user configuration.

Fixes: 09f1b7cb ("RDMA/hns: Support congestion control algorithm configuration at QP granularity")
Signed-off-by: Luoyouming <luoyouming@huawei.com>